JPS626948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polishing method and apparatus suitable for polishing lenses, particularly special lenses having a small diameter and a small radius of curvature.

Conventionally, commonly used lens polishing devices include a method in which a lens material is rotated on a rotating shaft, a polishing plate is placed over the lens material, and the lens material is moved back and forth to polish the lens material; There is a method of polishing by rotating both the polishing plate and the polishing plate at high speed, but in the former method, the polishing plate is reciprocated with a large stroke, so when the plate is reversed at both extremes, a large inertial force is generated and the phenomenon of uneven wear occurs. In addition, the polishing speed was slow. In addition, the latter type has a simple polishing trajectory, so it wears locally, creating scratches and steps on the lens surface, and the lens polishing curvature tends to change, making it impossible to produce large quantities of lenses with the same curvature, resulting in unstable quality. The disadvantage was that the accuracy was relatively low.

As an alternative to this, the applicant has proposed
We have previously proposed a lens polishing device as disclosed in Japanese Patent Publication No. 27395 (Japanese Patent Publication No. 14197/1983).
This device slides the lens material on a rotating polishing plate at high speed and tilts it back and forth. Although it can achieve relatively quickness and high precision, When the lens material is rotated, the lens material is swung outward by centrifugal force, and the abrasive liquid injected onto the polishing surface is scattered in all directions due to the high speed rotation of the lens material, and the entire polishing surface is Because it is difficult to distribute the lens uniformly, it is not possible to obtain lenses with higher precision and quality than a certain level.

Therefore, the present invention improves these drawbacks by using a method that is completely different from the many conventional lens polishing methods, is particularly suitable for polishing special lenses with small diameters and small curvature radii, and is highly accurate. It is an object of the present invention to provide a method and apparatus that can perform polishing quickly.

The method and device of the invention will be explained in detail below by means of an embodiment shown in the drawing.

A polishing shaft 2 is rotatably installed on a machine stand 1, and a polishing plate 3 is attached to the upper end of the polishing shaft 2 in a replaceable manner.
A vibrating body 4 is protruded from below, a spring 5 is attached to the vibrating body 4, and an electromagnet 6 is arranged facing each other to form a vibrating device 7, and the polishing shaft 2 is reciprocated to rotate the polishing plate 3. Slightly vibrate at high speed in the circumferential direction. On the other hand, a bearing arm 8 that can be moved up and down is provided on the machine base 1, and a slide shaft 11 formed as an air cylinder that is integrated in the rotational direction and expands and contracts in the axial direction is slidably fitted to the bearing arm 8. At the lower end of the piston rod 14 of the piston 13 fitted into the air cylinder portion 12 of the slide shaft 11, a lens holder 15 having a lens material L attached to the lower surface that contacts the polishing plate 3 is removably attached. Furthermore, a drive motor 16 is installed on the machine base 1, and a transmission mechanism 1 consisting of a reducer 17, a pulley, and a belt is installed.
A drive shaft 19 is rotated at a low speed through a shaft 8, and a connecting pin 20 protruding from the upper end of the slide shaft 11 is connected to the drive shaft 19 at an eccentric position.

With this structure, in order to polish the lens material L, the polishing plate 3 having the radius of curvature to be polished is attached to the polishing shaft 2, and the slide shaft 11
Attach the lens holding plate 5 with the lens material L attached to the piston rod 14 of the air cylinder section 1.
After the lens material L is pressed against the polishing plate 3 by the air of step 2, the vibration device 7 and the drive motor 16
When driven, the vibrating body 4 causes vibration by the vibrating device 7 and causes the polishing shaft 2 to rotate back and forth, so that the polishing plate 3 generates high-speed minute vibrations as it rotates around the polishing shaft 2. . On the other hand, the drive motor 16 rotates a drive shaft 19 at a low speed via a transmission mechanism 18, and a connecting pin 20 rotates a rotating shaft 9 and a sliding shaft 11 integrated therewith around a spherical bearing 10 of a bearing arm 8. The lens material L attached to the lower end of the lens material L rotates slowly at a low speed while being in pressure contact with the surface of the polishing dish 3, which vibrates slightly in the circumferential direction at high speed. The lens material L is removed by the abrasive liquid injected between
is polished.

As described above in detail with reference to the embodiments, the present invention is such that even if the lens material is slowly rotated at a low speed, the polishing plate slightly vibrates in the circumferential direction at a high speed. The relative speed between the material and the polishing plate is higher than that of the conventional polishing plate, while the lens material rotates at a slow and slow speed, so it is difficult to move outward due to centrifugal force. A highly accurate lens can be obtained without causing any blurring or the like. Furthermore, the abrasive liquid injected between the lens material and the polishing plate is not scattered due to centrifugal force and is evenly distributed to the center of the polishing surface where the two come into contact with each other, resulting in extremely high quality lenses without seizure. Can be polished quickly. In particular, the present invention allows a small-diameter lens to be rotated at low speed in a polishing dish with an extremely small radius of curvature, so lenses for medical endoscopes, in which small-diameter, high-precision lenses are particularly desired in recent years. This method is extremely suitable as a method and device for polishing lenses for laser-related equipment.

[Brief explanation of the drawing]

FIG. 1 is a side view of a polishing device according to the present invention, with main parts cut away, and FIG. 2 is a cross-sectional plan view of the vibrating device. 2... Polishing shaft, 3... Polishing plate, 4... Vibration device, 9...
Rotating shaft, 10... Spherical bearing, 11... Slide shaft, 1
5... Lens holder, 16... Drive motor, 17
...Reducer, 19...Drive shaft, 20...Connection pin, L...
lens material.

Claims (1)

[Claims] 1. A polishing plate and a lens material are brought into contact with each other, and one of them is slightly vibrated so as to rotate back and forth at a high speed around a rotation axis, while the other is rotated at a low speed. A lens polishing method characterized by polishing by polishing. 2. A polishing plate attached to a polishing shaft, and a vibration device that drives the polishing shaft to slightly vibrate the polishing plate so as to reciprocate at high speed around the polishing shaft;
A rotating shaft including a lens holder that holds the lens material attached to the tip in contact with the polishing dish, a spherical bearing that rotatably supports the rotating shaft, and the lens material is lowered on the polishing dish using the spherical bearing as a fulcrum. A lens polishing device comprising: a drive device that rotates a rotation shaft eccentrically with respect to a drive shaft in order to rotate a miso paste at a high speed.